Microsoft's court filing specifically mentioned the Motorola Droid 2 and the Motorola Charm smartphones, but Microsoft claims that the infringements were not limited to those devices.

Horacio Gutierrez, Microsoft's corporate vice president, said in a statement that his company has "a responsibility to our customers, partners, and shareholders to safeguard the billions of dollars we invest each year in bringing innovative software products and services to market."

"Motorola needs to stop its infringement of our patented inventions in its Android smartphones," Gutierrez added.